Thank you for joining the thread, Nuttymom.

As mentioned by my colleague, there's an ongoing investigation (INV-105679) regarding Expense Categories not showing in the QuickBooks Online Mobile App for iOS devices.

I recommend contacting our support so they can add you to the affected users' list and provide updates about the status of the investigation via email.

Here's how:

1. Go to Help.
2. Select Search.
3. Click the Contact Us button and enter your concern.
4. Press Continue. 

You can check our support hours by visiting this article: QuickBooks Online Support. 

If you're using an Android device, you can follow these steps for basic troubleshooting.

Here's How:

1. Go to the More Options.
2. Select Settings.
3. Click Refresh Data.
4. Then select Yes.

If the issue persists, you can uninstall and reinstall the Online mobile application. This will free up the storage without deleting your app's documents and data. Otherwise, you can access your QBO using other supported browsers.

Nevertheless, you can compare mobile app features and see QuickBooks Online access for mobile devices to learn which QuickBooks Online app features are supported on mobile devices.

We appreciate your patience and understanding as we work towards resolving this issue. If you need further assistance with managing your expense categories or anything else, just reply below, and I'll circle back to help you.